Window-sash lock.



N. KAHN.

WINDOW SASH LOCK. APPLICATION FILED $23.24, 1912.

1,043,842, Patented NOV. 12,1912.

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IINIIUD STATES rn'rnnr ormoni.

NATHANIEL KAI-IN, 0F NEW YORK, N. Y., ASSIGNOB. 0F ONE-HALE TO SIDNEY L.ROOT, 0F NEW YORK, N. Y.

WINDOW-SASH LOCK.

Specification of Letters Patent.

Patented Nov. i2, i912.

Application led. February 24, 1912. Serial No. 679,661.

To all 'whom it may concern:

Be it known that I, NATHANIEL KAHN, a citizen of the UnitedStates, andresiding at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Window-Sash Locks,of which the following is a specification, such as will enable thoseskilled in the art to which it appertains to make and use the same.

This invention relates to window sash locks, and the object thereof isto provide an improved device of this class which is independent of thesash or window frame, but which may be quickly and easily applied so asto lock both sashes in a closed position whenever desired.

The invention is fully disclosed in the following specification of whichthe accompanying drawing forms a part in which the separate parts of myinvention are designated by suitable reference characters` in each ofthe views, and in which Figure l is a perspective view showing part of-awindow frame and part of both sashes, and showing my improved sash lockapplied and ;-Fig. 2 a section on the line 2 2 of Fig. 1.

In the drawing forming part of this specification I have shown at a apart of one side of a window frame, and I have also shown at Z9 a partof the upper sash, and at c a part of the lower sash, and the frame a isprovided with the usual beads or strips d and e between which the lowersash is mounted, the outer bead or strip (l also serving as one of theguides for the upper sash.

My improved sash lock comprises a back plate f and a front plate gslidably mounted one upon the other, and the back plate f is provided atits top and bottom edges with longitudinal keepers f1 in which the frontplate g is longitudinally movable. The front plate g is provided at itsouter end with a right angled member g2 having sharp pointed teeth g3 onits outer surface, and the back plat-e f is provided at its front endwith a similar right angled member f2 having sharp pointed teeth f3 onits inner surface. The front plate g is also provided in its inner endportion with a longitudinal slot g4, and passed through the back plate fand through the slot g4 is a screw or bolt L, and mounted on said boltin front of the plate g is an arm i which ranges forwardly 1 andlongitudinally of said plate g, and through which is passed a threadedscrew or bolt j which also passes through a curved slot g5 in the plateg, and the screw or bolt y' 1s provided with a thumb nut la, and mountedon said screw or bolt, between the plate g and the arm 2', is a lever mwhich is pivoted to the plate g at m2 and which ranges crosswise of saidplate and the slot g5, and is provided with a handle portion m3, and theslot g5 is concentric to the pivoted point of the lever m.

The screw or bolt h is preferably provided with two washers n and n2, asshown, and it will be observed that the front plate g is longer than theback plate j, and is provided with a projecting end portion gG in whichthe slot g5 is formed, and on which the lever m is mounted, and theoperation will be readily understood from the foregoing description,when taken in connection with the accompanying drawing, and thefollowing statement thereof.

In order to apply this device the sashes are closed, as shown in F ig.l, and the lock is placed in position ov'er the bottom sash, as is alsoshown, with the right angled member g2 of the plate g between one sideof the top sash and the adjacent bead or strip CZ, and the right angledmember )"2 of the plate f fitting against the inner side of the bead orstrip e, and with the parts adjusted to this position the lever m ismoved in the direction of the arrow ze. This movement of said leverforces the plate f forwardly, and the plate g backwardly, and forces theteeth f3 into the bead or strip e and the teeth g3 into the side of thetop sash, and the sash lock is securely held in position, and the sashesb and c are locked against movement. It will be understood that in orderto manipulate the lever m the nut 7c must be loosened and when saidlever is in operative position, as above described the nut /c must betightened; it will also be understood that in order to adjust the platesg and f into the desired position for use, t-he nut 7c must also beloosened.

My improved sash lock may be made of any desired dimensions, and byreason of the possible adjustment of the plates f and g as abovedescribed the said sash lock may be applied to windows, or window sashesof varying transverse dimensions; and changes in and modifications ofthe construction herein described, may be made, within the scope of theappended claim, Without departing from the spirit of myinvention orsacrificing its advantages.

Having fully described my invention what I claim as neiv and desire tosecure by Letters Patent is A sash look comprising a back plate and afront 'plate movable longitudinally thereon, said plates being providedattheir corresponding outer ends with right angled members which projectin the same diretion, and one of which is provided on its outer and theother on its inner surface with teeth, the front plate being alsoprovidedwith a central longitudinal slot and in the inner end portionthereof with a curved slot,'a lever pivoted to the front end portionofthe front plateand ranging transversely of the curved slot, and a boltpassed through said curved slot and through said lever and through thefree end of said arm.

In testimony that I claim the foregoing as my invention I have signed myname in presence of the subscribing Witnesses this 23rd day of February,1912.

Y NATHANIEL KAHN.

Coo'ies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

